How to Care for Stoneware: Dishwasher, Microwave, and the One Thing to Avoid

Stoneware is tougher than it looks, which is the point of it. It's clay fired at a high temperature, somewhere around 1,200°C, until the body becomes dense and low in porosity. That density is why a well-made, well-glazed stoneware piece shrugs off daily use and gives you a water-tight surface to eat off. Caring for it is mostly common sense, but a couple of points trip people up, so here's the full version.

The dishwasher is fine. Hand-washing is kinder.

Glazed stoneware is generally dishwasher-safe, and you won't hurt it by running it through. Over years, though, hand-washing keeps the glaze looking its best. Use a soft sponge and mild dish soap. Skip bleach and abrasive powders, which can dull or discolor a glaze over time. If you only remember one habit, make it “soft sponge, no harsh chemicals.”

The microwave is usually fine, with one real exception.

Plain glazed stoneware with no metallic decoration heats up in the microwave without trouble. But any metallic accent is a different story. A gold or silver rim, a metallic luster, a painted metallic detail: none of those belong in a microwave. Metal reflects microwaves and concentrates the energy, which causes sparking, burn marks, and sometimes cracks. So before you microwave a piece, look at it. If it has any shiny metal trim, heat your food in something else. Reactive glazes themselves are not metal, even when they look coppery or pewter, but if you're ever unsure about a specific piece, treat it as not microwave-safe.

The one thing that actually breaks stoneware: sudden temperature changes.

This is thermal shock, and it's the most common way people crack a good piece. Don't move a dish straight from the freezer or fridge into a hot oven. Don't set a hot dish into cold water or back into the fridge. Don't pour boiling liquid into a cold bowl. The clay and the glaze expand at slightly different rates, and a fast, uneven temperature swing can crack the body or craze the glaze. When you do want to use an oven-safe piece in the oven, start with room-temperature food and bring the heat up gradually rather than blasting it.

About crazing.

Crazing is the fine web of surface lines you sometimes see in a glaze, easiest to spot when you tilt the piece under a light. It usually comes from repeated thermal stress, and denser stoneware resists it better than softer ceramics. No glaze is completely immune if you keep shocking it with temperature, so the prevention is the same as above: avoid the big swings. Crazing lines can also trap color from coffee, tea, or tomato sauce over time, which is another reason to wash sooner rather than letting things soak.

You don't need to “season” it.

Seasoning is for raw, unglazed clay bakeware, which is a different product. Everyday glazed stoneware just needs a wash before its first use. That's the whole ritual.

A note specific to reactive-glaze pieces like ours: because the glaze is made by a chemical reaction in the kiln, color and pattern vary from piece to piece, and small differences in finish are normal rather than flaws. If you want the why behind that, we wrote it up separately.

Treat a stoneware piece reasonably and it lasts for years. Wash it gently, keep metal out of the microwave, and don't shock it with heat. That's it.